diff --git a/src/ec/hp/kbc1126/Makefile.inc b/src/ec/hp/kbc1126/Makefile.inc
index 92a0a72c02..e136757770 100644
--- a/src/ec/hp/kbc1126/Makefile.inc
+++ b/src/ec/hp/kbc1126/Makefile.inc
@@ -21,7 +21,7 @@ ifeq ($(CONFIG_KBC1126_FIRMWARE),y)
 	printf "    Building kbc1126_ec_insert.\n"
 	$(MAKE) -C util/kbc1126
 	printf "    KBC1126    Inserting KBC1126 firmware blobs.\n"
-	flock $< $(KBC1126_EC_INSERT) $(obj)/coreboot.pre \
+	$(KBC1126_EC_INSERT) $(obj)/coreboot.pre \
 		$(CONFIG_KBC1126_FW1_OFFSET) $(CONFIG_KBC1126_FW2_OFFSET)
 endif
 
diff --git a/src/soc/amd/stoneyridge/Makefile.inc b/src/soc/amd/stoneyridge/Makefile.inc
index a1771e8582..900d48b01f 100644
--- a/src/soc/amd/stoneyridge/Makefile.inc
+++ b/src/soc/amd/stoneyridge/Makefile.inc
@@ -170,7 +170,7 @@ STONEYRIDGE_FWM_ROM_POSITION=$(call int-add, \
 $(call add_intermediate, add_amdfw, $(obj)/coreboot.pre $(obj)/amdfw.rom)
 	printf "    DD         Adding AMD Firmware at ROM offset 0x%x\n" \
 		"$(STONEYRIDGE_FWM_ROM_POSITION)"
-	flock $< dd if=$(obj)/amdfw.rom \
+	dd if=$(obj)/amdfw.rom \
 		of=$(obj)/coreboot.pre conv=notrunc bs=1 \
 		seek=$(STONEYRIDGE_FWM_ROM_POSITION) >/dev/null 2>&1
 
diff --git a/src/southbridge/amd/pi/hudson/Makefile.inc b/src/southbridge/amd/pi/hudson/Makefile.inc
index 5a85fb6add..caa49b874c 100644
--- a/src/southbridge/amd/pi/hudson/Makefile.inc
+++ b/src/southbridge/amd/pi/hudson/Makefile.inc
@@ -159,7 +159,7 @@ $(obj)/amdfw.rom:	$(call strip_quotes, $(CONFIG_HUDSON_XHCI_FWM_FILE)) \
 ifeq ($(CONFIG_AMDFW_OUTSIDE_CBFS),y)
 $(call add_intermediate, add_amdfw, $(obj)/coreboot.pre $(obj)/amdfw.rom)
 	printf "    DD         Adding AMD Firmware\n"
-	flock $< dd if=$(obj)/amdfw.rom \
+	dd if=$(obj)/amdfw.rom \
 		of=$(obj)/coreboot.pre conv=notrunc bs=1 seek=131072 >/dev/null 2>&1
 
 else # ifeq ($(CONFIG_AMDFW_OUTSIDE_CBFS),y)
diff --git a/src/southbridge/intel/common/firmware/Makefile.inc b/src/southbridge/intel/common/firmware/Makefile.inc
index 127da190b4..d5a48fd6f9 100644
--- a/src/southbridge/intel/common/firmware/Makefile.inc
+++ b/src/southbridge/intel/common/firmware/Makefile.inc
@@ -35,7 +35,7 @@ add_intel_firmware: $(call strip_quotes,$(CONFIG_EC_BIN_PATH))
 endif
 add_intel_firmware: $(obj)/coreboot.pre $(IFDTOOL)
 	printf "    DD         Adding Intel Firmware Descriptor\n"
-	flock $< dd if=$(IFD_BIN_PATH) \
+	dd if=$(IFD_BIN_PATH) \
 		of=$(obj)/coreboot.pre conv=notrunc >/dev/null 2>&1
 ifeq ($(CONFIG_VALIDATE_INTEL_DESCRIPTOR),y)
 	$(objutil)/ifdtool/ifdtool \